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Title: On the Surface Swarming of Euphausiid Crustaceans 
Author: Komaki, Yuzo
Date: 1967-10
Publisher: University of Hawai'i Press
Citation: Komaki Y. 1967. On the surface swarming of Euphausiid crustaceans. Pac Sci 21(4): 433-448.
Abstract: A general aspect of the daytime surface swarming of Euphausia
pacifica in Japanese nearshore waters is described in connection with the water
temperature. Swarming usually starts with a local minimum temperature around
7°C and terminates with a temperature just below 16°C. The swarming season is
essentially in spring, from February through May, with little difference among
regions. The main swarming areas are on the Pacific coast around Kinkazan, and
on the coast of the Sea of Japan around Sadogashima, in Wakasawan and its
vicinity, around Oki, and on the east side of the Tsushima Gunto.
It is shown that the swarming is closely related to cold water masses, and that
the approach of offshore cold water masses to the nearshore areas and the mixing
process in the coastal areas may provide favorable conditions for swarming .
Swarming of E. pacifica is a phenomenon that occurs at the margins of the cold
water bodies, and is related to the seasonal change in the geographical distribution
of those euphausiids.
A uniformly low water temperature profile must be the necessary condition for
swarming, but other possible factors stimulating euphausiids to swarm are
ISSN: 0030-8870

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